OK, I am by no means an expert on portraiture but here are my thoughts.
This is the image that jumped out for me. I like the composition and light and it suggests a story where the reader can fill in the details of who she is and who she might be looking at.
Untitled by Michael_Sergio_Barnes, on Flickr
As Andrew mentioned the edges are too tight and you need a bit more room for the head an elbow. Also, unfortunately her bottom hand looks kind of weird (like a foot?) but I know that I would never have noticed that when I was composing the shot.
Overall that set is really nice use of the window light. What else were you using for light sources?